{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "Herein , a method is reported for controlling the twinning structure of silver nanoparticles , and consequently their shape , via the plasmon - mediated synthesis , solely by varying the excitation wavelength between 400 , 450 , and 500 nm , which modulates the rate of Ag ( + ) reduction ."}
{"Chemical": ["silver", "Ag ( + )"]}